fix(init): 确保 Registry 在服务启动时正确初始化

- AgentRegistry: 在构造函数中同步初始化预设 Agent
- AgentRegistry: 添加 isInitialized() 方法
- initCore(): 添加 ProviderRegistry.init() 调用
- initCore(): 添加 AgentRegistry.init() 调用

修复用户配置（Provider、Agent）重启后丢失的问题

packages/server/src/agent/adapter.ts

@@ -76,6 +76,22 @@ interface PermissionManager {
   setAskCallback(callback: (ctx: unknown) => Promise<{ allow: boolean; remember?: boolean }>): void;
 }
 
+/**
+ * Provider Registry 接口
+ */
+interface ProviderRegistryInterface {
+  init(workdir?: string): Promise<void>;
+  isInitialized(): boolean;
+}
+
+/**
+ * Agent Registry 接口
+ */
+interface AgentRegistryInterface {
+  init(workdir: string): Promise<void>;
+  isInitialized(): boolean;
+}
+
 /**
  * Core 模块接口
  */
@@ -85,6 +101,8 @@ interface CoreModule {
   loadConfig: () => unknown;
   saveConfig: (config: Record<string, unknown>) => void;
   getPermissionManager: (projectRoot?: string) => PermissionManager;
+  getProviderRegistry: () => ProviderRegistryInterface;
+  agentRegistry: AgentRegistryInterface;
 }
 
 // ============================================================================
@@ -120,6 +138,20 @@ export async function initCore(): Promise<boolean> {
       return false;
     }
 
+    // 初始化 ProviderRegistry（加载用户配置）
+    const providerRegistry = core.getProviderRegistry();
+    if (!providerRegistry.isInitialized()) {
+      await providerRegistry.init();
+      console.log('[Agent] ProviderRegistry initialized');
+    }
+
+    // 初始化 AgentRegistry（加载用户自定义 Agent 配置）
+    const agentRegistry = core.agentRegistry;
+    if (!agentRegistry.isInitialized()) {
+      await agentRegistry.init(process.cwd());
+      console.log('[Agent] AgentRegistry initialized');
+    }
+
     coreModule = core;
     console.log('[Agent] Core module loaded');
     return true;